CVE-2026-57918

Publication date 26 June 2026

Last updated 30 June 2026

Ubuntu priority

Cvss 3 Severity Score

Description

libnfs through 6.0.2 before 935b8db has an xid integer underflow in READ_IOVEC in rpc_read_from_socket in lib/socket.c during a connection to a crafted NFS server, when the expected pdu size exceeds the absolute pdu size from the xid/record-marker.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libnfs	26.04 LTS resolute	Not affected
	25.10 questing	Not affected
	24.04 LTS noble	Not affected
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected

Notes

mdeslaur

per Debian, introduced in 6.0.0 by: https://github.com/sahlberg/libnfs/commit/5e8f7ce273308eb77f94248f4501e574a703c1a5

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libnfs	Upstream: 935b8db

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.1 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	Low

Scores

Parameter	Value
Base score	7.1 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L

References

Other references

https://www.cve.org/CVERecord?id=CVE-2026-57918